{"assessment":{"best_window":{"end":"2027-03-23T02:50Z","end_local":"04:50","hours":8.67,"label":"marginal","mean_quality":0.4,"start":"2027-03-22T18:10Z","start_local":"20:10"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.58,"moon":5.52},"formula":"astronomy = 100 * min(1, sky_hours / reference_hours) * peak_sky; overall = astronomy * score_weather / 100 (null when the weather is unknown)","hard_limit":null,"headline":"Astronomically possible, with compromises \u2014 weather unknown","hourly":[{"alt":null,"cloud":null,"high":null,"iso":"2027-03-22T17:00Z","label":"unusable","low":null,"mid":null,"moon_alt":0,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-22T18:00Z","label":"poor","low":null,"mid":null,"moon_alt":11,"precip":null,"q":0.26,"rh":null,"sky":"astronomical twilight","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-22T19:00Z","label":"marginal","low":null,"mid":null,"moon_alt":20,"precip":null,"q":0.46,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-22T20:00Z","label":"marginal","low":null,"mid":null,"moon_alt":29,"precip":null,"q":0.41,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-22T21:00Z","label":"marginal","low":null,"mid":null,"moon_alt":36,"precip":null,"q":0.37,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-22T22:00Z","label":"marginal","low":null,"mid":null,"moon_alt":40,"precip":null,"q":0.35,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-22T23:00Z","label":"marginal","low":null,"mid":null,"moon_alt":40,"precip":null,"q":0.34,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-23T00:00Z","label":"marginal","low":null,"mid":null,"moon_alt":38,"precip":null,"q":0.36,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-23T01:00Z","label":"marginal","low":null,"mid":null,"moon_alt":32,"precip":null,"q":0.39,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-23T02:00Z","label":"marginal","low":null,"mid":null,"moon_alt":24,"precip":null,"q":0.44,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-23T03:00Z","label":"poor","low":null,"mid":null,"moon_alt":14,"precip":null,"q":0.25,"rh":null,"sky":"astronomical twilight","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-03-23T04:00Z","label":"unusable","low":null,"mid":null,"moon_alt":4,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"06:00","wind":null}],"peak_quality":0.52,"peak_sky":0.52,"quality_hours":3.82,"reasons":["moonlight cost 5.5 quality-hours","daylight and twilight cost 2.6 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":49,"score_weather":null,"sky_hours":3.82,"verdict":"unknown","verdict_astronomy":"marginal","weather_known":false,"windows":[{"end":"2027-03-22T17:05Z","end_local":"19:05","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-03-22T16:30Z","start_local":"18:30"},{"end":"2027-03-22T18:10Z","end_local":"20:10","hours":1.08,"label":"poor","mean_quality":0.17,"start":"2027-03-22T17:05Z","start_local":"19:05"},{"end":"2027-03-23T02:50Z","end_local":"04:50","hours":8.67,"label":"marginal","mean_quality":0.4,"start":"2027-03-22T18:10Z","start_local":"20:10"},{"end":"2027-03-23T03:55Z","end_local":"05:55","hours":1.08,"label":"poor","mean_quality":0.16,"start":"2027-03-23T02:50Z","start_local":"04:50"},{"end":"2027-03-23T04:25Z","end_local":"06:25","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-03-23T03:55Z","start_local":"05:55"}]},"calculation_version":"2026-10-10.1","forecast":[],"forecast_source":"none","forecast_updated_at":null,"limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2027-03-22T18:08:39Z","dark_hours":8.63,"dark_to":"2027-03-23T02:46:29Z","moon":{"illumination":0.996,"phase":"full moon","waxing":false},"moon_free_dark_hours":0.0,"moonrise":"2027-03-22T16:59:56Z","moonset":"2027-03-23T04:20:08Z","sunrise":"2027-03-23T04:20:02Z","sunset":"2027-03-22T16:34:59Z","twilight":{"astronomical":{"end":"2027-03-22T18:08:39Z","start":"2027-03-23T02:46:29Z"},"civil":{"end":"2027-03-22T17:02:45Z","start":"2027-03-23T03:52:18Z"},"nautical":{"end":"2027-03-22T17:35:21Z","start":"2027-03-23T03:19:45Z"}},"window_end":"2027-03-23T10:00:00Z","window_start":"2027-03-22T10:00:00Z"},"night_date":"2027-03-22","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":["No cloud data for this night (beyond the 4-day forecast, or not yet in the archive) \u2014 the score is geometry only."]}
